Hi, I've got two inet connections, one comes from a D-link router that at the same time does the function of switch. The other connection is managed by a Cisco 1721. My idea is to focus all the security/traffic filtering on the Cisco router and then send back the traffic to the D-link subnet stations. The D-link has the subnet address 192.168.0.1 and the Cisco the 192.168.1.1. Thanks for your help !